PROBLEM TO BE SOLVED: To provide a useful synthetic intermediate for (S)-2-(2-chlorophenyl)-2-(4,5,6,7-tetrahydrothieno[3,2-c]-5-pyridyl)methyl acetate, "clopidgrel".SOLUTION: An (R)-sulphonyloxyacetate derivative is expressed by formula (I) (wherein, R1 is a benzyl group, a 1-4C alkyl group optionally substituted with one or more halogen atoms, or a phenyl group optionally substituted with one or more halogen atoms, one or more linear or branched 1-4C alkyl groups, or a nitro group).COPYRIGHT: (C)2009,JPO&INPIT【課題】(S)-2-(2-クロロフェニル)-2-(4,5,6,7-テトラヒドロチエノ[3,2-c]-5-ピリジル)酢酸メチル、すなわちクロピドグレル(clopidgrel)の有用な合成中間体の提供。【解決手段】一般式(I)[式中、R1はベンジル基、1もしくは幾つかのハロゲン原子で任意に置換されたC1-C4アルキル又は1もしくは幾つかのハロゲン原子、又は1もしくは幾つかの直鎖状あるいは分枝状のC1-C4アルキル基又はニトロ基で任意に置換されたフェニル基を示す]の(R)-スルホニルオキシ酢酸エステル誘導体。【選択図】なし
